spi: cadence-qspi: reset qspi flash for versal platform

When flash operated at non default mode like DDR, flash need to be reset
to operate in SDR mode to read flash ids by spi-nor framework. Reset the
flash to the default state before using the flash. This reset is handled
by a gpio driver, in case of mini U-Boot as gpio driver is disabled, we
do raw read and write access by the registers.
Versal platform utilizes spi calibration for read delay programming, so
incase by default read delay property is set in DT. We make sure not to
use read delay from DT by overwriting read_delay with -1.

Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Link: https://lore.kernel.org/r/20220512100535.16364-4-ashok.reddy.soma@xilinx.com
Signed-off-by: Michal Simek <michal.simek@amd.com>

arch/arm/mach-versal/include/mach/hardware.h

@@ -82,3 +82,14 @@ struct crp_regs {
 #define JTAG_MODE	0x00000000
 #define BOOT_MODE_USE_ALT	0x100
 #define BOOT_MODE_ALT_SHIFT	12
+
+#define FLASH_RESET_GPIO	0xc
+#define WPROT_CRP	0xF126001C
+#define RST_GPIO	0xF1260318
+#define WPROT_LPD_MIO	0xFF080728
+#define WPROT_PMC_MIO	0xF1060828
+#define BOOT_MODE_DIR	0xF1020204
+#define BOOT_MODE_OUT	0xF1020208
+#define MIO_PIN_12	0xF1060030
+#define BANK0_OUTPUT	0xF1020040
+#define BANK0_TRI	0xF1060200

drivers/spi/cadence_ospi_versal.c

@@ -125,3 +125,89 @@ int cadence_qspi_apb_wait_for_dma_cmplt(struct cadence_spi_plat *plat)
 	       plat->regbase + CQSPI_DMA_DST_I_STS_REG);
 	return 0;
 }
+
+#if defined(CONFIG_DM_GPIO)
+int cadence_spi_versal_flash_reset(struct udevice *dev)
+{
+	struct gpio_desc gpio;
+	u32 reset_gpio;
+	int ret;
+
+	/* request gpio and set direction as output set to 1 */
+	ret = gpio_request_by_name(dev, "reset-gpios", 0, &gpio,
+				   GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
+	if (ret) {
+		printf("%s: unable to reset ospi flash device", __func__);
+		return ret;
+	}
+
+	reset_gpio = PMIO_NODE_ID_BASE + gpio.offset;
+
+	/* Request for pin */
+	xilinx_pm_request(PM_PINCTRL_REQUEST, reset_gpio, 0, 0, 0, NULL);
+
+	/* Enable hysteresis in cmos receiver */
+	xilinx_pm_request(PM_PINCTRL_CONFIG_PARAM_SET, reset_gpio,
+			  PM_PINCTRL_CONFIG_SCHMITT_CMOS,
+			  PM_PINCTRL_INPUT_TYPE_SCHMITT, 0, NULL);
+
+	/* Disable Tri-state */
+	xilinx_pm_request(PM_PINCTRL_CONFIG_PARAM_SET, reset_gpio,
+			  PM_PINCTRL_CONFIG_TRI_STATE,
+			  PM_PINCTRL_TRI_STATE_DISABLE, 0, NULL);
+	udelay(1);
+
+	/* Set value 0 to pin */
+	dm_gpio_set_value(&gpio, 0);
+	udelay(1);
+
+	/* Set value 1 to pin */
+	dm_gpio_set_value(&gpio, 1);
+	udelay(1);
+
+	return 0;
+}
+#else
+int cadence_spi_versal_flash_reset(struct udevice *dev)
+{
+	/* CRP WPROT */
+	writel(0, WPROT_CRP);
+	/* GPIO Reset */
+	writel(0, RST_GPIO);
+
+	/* disable IOU write protection */
+	writel(0, WPROT_LPD_MIO);
+
+	/* set direction as output */
+	writel((readl(BOOT_MODE_DIR) | BIT(FLASH_RESET_GPIO)),
+	       BOOT_MODE_POR_0);
+
+	/* Data output enable */
+	writel((readl(BOOT_MODE_OUT) | BIT(FLASH_RESET_GPIO)),
+	       BOOT_MODE_POR_1);
+
+	/* IOU SLCR write enable */
+	writel(0, WPROT_PMC_MIO);
+
+	/* set MIO as GPIO */
+	writel(0x60, MIO_PIN_12);
+
+	/* Set value 1 to pin */
+	writel((readl(BANK0_OUTPUT) | BIT(FLASH_RESET_GPIO)), BANK0_OUTPUT);
+	udelay(10);
+
+	/* Disable Tri-state */
+	writel((readl(BANK0_TRI) & ~BIT(FLASH_RESET_GPIO)), BANK0_TRI);
+	udelay(1);
+
+	/* Set value 0 to pin */
+	writel((readl(BANK0_OUTPUT) & ~BIT(FLASH_RESET_GPIO)), BANK0_OUTPUT);
+	udelay(10);
+
+	/* Set value 1 to pin */
+	writel((readl(BANK0_OUTPUT) | BIT(FLASH_RESET_GPIO)), BANK0_OUTPUT);
+	udelay(10);
+
+	return 0;
+}
+#endif

drivers/spi/cadence_qspi.c

@@ -33,6 +33,11 @@ __weak int cadence_qspi_apb_dma_read(struct cadence_spi_plat *plat,
 	return 0;
 }
 
+__weak int cadence_qspi_versal_flash_reset(struct udevice *dev)
+{
+	return 0;
+}
+
 static int cadence_spi_write_speed(struct udevice *bus, uint hz)
 {
 	struct cadence_spi_plat *plat = dev_get_plat(bus);
@@ -220,6 +225,16 @@ static int cadence_spi_probe(struct udevice *bus)
 
 	plat->wr_delay = 50 * DIV_ROUND_UP(NSEC_PER_SEC, plat->ref_clk_hz);
 
+	if (CONFIG_IS_ENABLED(ARCH_VERSAL)) {
+		/* Versal platform uses spi calibration to set read delay */
+		if (plat->read_delay >= 0)
+			plat->read_delay = -1;
+		/* Reset ospi flash device */
+		ret = cadence_qspi_versal_flash_reset(bus);
+		if (ret)
+			return ret;
+	}
+
 	return 0;
 }
 

drivers/spi/cadence_qspi.h

@@ -283,5 +283,6 @@ int cadence_qspi_apb_dma_read(struct cadence_spi_plat *plat,
 			      const struct spi_mem_op *op);
 int cadence_qspi_apb_wait_for_dma_cmplt(struct cadence_spi_plat *plat);
 int cadence_qspi_apb_exec_flash_cmd(void *reg_base, unsigned int reg);
+int cadence_qspi_versal_flash_reset(struct udevice *dev);
 
 #endif /* __CADENCE_QSPI_H__ */

include/zynqmp_firmware.h

@@ -428,6 +428,8 @@ enum pm_gem_config_type {
 
 #define PMUFW_V1_0	((1 << ZYNQMP_PM_VERSION_MAJOR_SHIFT) | 0)
 
+#define PMIO_NODE_ID_BASE		0x1410801B
+
 /*
  * Return payload size
  * Not every firmware call expects the same amount of return bytes, however the